21879674 has 8 divisors (see below), whose sum is σ = 32852820. Its totient is φ = 10928736.

The previous prime is 21879661. The next prime is 21879701. The reversal of 21879674 is 47697812.

It can be written as a sum of positive squares in 2 ways, for example, as 12909649 + 8970025 = 3593^2 + 2995^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2819 + ... + 7190.

Almost surely, 2^21879674 is an apocalyptic number.

21879674 is a deficient number, since it is larger than the sum of its proper divisors (10973146).

21879674 is a wasteful number, since it uses less digits than its factorization.

21879674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11104.

The product of its digits is 169344, while the sum is 44.

The square root of 21879674 is about 4677.5713783971. The cubic root of 21879674 is about 279.6921531575.

The spelling of 21879674 in words is "twenty-one million, eight hundred seventy-nine thousand, six hundred seventy-four".